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Unsound Circuitry Bloodletter
Photo: RockBoard
Unsound Circuitry

Unsound Circuitry Bloodletter

DistortionAnalog
Key facts
TypeDistortion and fuzz pedal1
MakerUnsound Circuitry1
Circuit based onBoss HM-21
Circuit typeAnalog1
Power9V DC, center negative, 20 mA1

The Unsound Circuitry Bloodletter is an analog distortion and fuzz pedal, listed in both the distortion and fuzz categories. The maker describes it as "an unsound love letter to the appraised beast that is Boss HM-2," meaning its circuit is based on Boss's HM-2 heavy metal distortion. according to RockBoard's PedalPedia, it is "similar enough to the HM-2 to gratify those who are looking for a clone while also including extra features."1

For players chasing the Swedish death metal sound associated with the HM-2, the Bloodletter sits in the same territory as other pedals in the distortion and fuzz families, with the added features the maker mentions on top of the original circuit's behavior.1

Power and circuit

The Bloodletter runs on an analog circuit and takes a 9V DC, center negative supply, drawing 20 mA. That current draw is modest enough to sit comfortably on a shared power supply alongside other typical pedals.1

Videos

Unsound Circuitry Bloodletter & Boss HM-2w // Chainsaw demo
UNSOUND CIRCUITRY
Sources (1)
  1. Bloodletter by Unsound Circuitry, RockBoard (rockboard.de PedalPedia), 2026